RADIATION RESISTANT HIGH ENTROPY ALLOYS FOR FAST REACTOR CLADDING APPLICATIONS

用于快堆包壳应用的抗辐射高熵合金

• 批准号: EP/R006245/1
• 负责人: David Armstrong
• 金额: $ 55.67万
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FR006245%2F1
• 关键词: RADIATION; RESISTANT; ENTROPY; ALLOYS; FAST

High entropy alloys are a recently developed novel class of materials in which no one element dominates. Instead four or more elements are used in near equal proportions. These alloys have been reported to have a wide range of attractive properties including high strengths at high temperatures, good corrosion resistance and ability to withstand irradiation damage. These properties make HEAs strong candidate materials for use as fuel cladding in sodium cooled fast reactors. These reactors can operate at higher temperatures, using less fuel and are safer than current water and gas cooled reactors.However if HEAs are to be utilised in this highly aggressive environment there are two key needs that must be addressed. The first is to identify promising alloy compositions, manufacture them and characterise their mechanical behaviour. Secondly the mechanisms that lead to the excellent resistance to irradiation damage need to be understood. Through this we will establish whether the irradiation response is universal to all HEAs and devise strategies to predict other potentially better systems to investigate. This grant will use ion irradiations rather than neutrons as ion irradiations are cheaper and faster to carry out and allow for more rapid turn around in alloy development. How the structure of the alloys is changed by irradiation will be studied using advanced microscopy methods and the effect the irradiation has on the mechanical behaviour will be studied using novel micro-mechanical testing methods. Importantly these methods can be used to measure mechanical behaviour at temperatures over 900oC, so the mechanical properties at the operational temperature can be studied in both irradiated and unirradiated conditions. Once the most promising alloys, with the best resistance to irradiation damage, have been identified their resistance to liquid sodium corrosion will be studied. In this way we will develop a novel alloy which can be used as fuel cladding in sodium cooled fast reactors.

高熵合金是最近开发的新型材料类别，其中没有一个元素主导。相反，四个或多个元素的比例几乎相等。据报道，这些合金具有广泛的有吸引力的特性，包括高温下的高强度，良好的耐腐蚀性和承受辐射损伤的能力。这些特性使HEAS强的候选材料可用作钠冷却的快速反应堆中的燃料包层。这些反应堆可以在更高的温度下运行，使用较少的燃料，并且比当前的水和气体冷却反应器更安全。但是，如果在这个高度激进的环境中使用HEAS，则必须满足两种关键需求。首先是确定有希望的合金组成，制造它们并表征其机械行为。其次，需要理解导致对辐射损害的极好抵抗力的机制。通过此，我们将确定辐射响应是否对所有HEAS都普遍，并制定了预测其他潜在更好的调查系统的策略。该赠款将使用离子辐照，而不是中子，因为离子辐射更便宜，更快，可以在合金开发中更快地转动。将使用高级显微镜方法研究合金的结构如何通过辐射进行研究，并使用新型的微型机械测试方法研究辐射对机械行为的影响。重要的是，这些方法可用于在900oC以上的温度下测量机械行为，因此可以在辐照和非辐照条件下研究操作温度下的机械性能。一旦最有前途的合金具有对辐照损伤的最佳耐药性，就可以研究其对液体钠腐蚀的耐药性。这样，我们将开发一种新型合金，可以用作钠冷却的快速反应器中的燃料包层。

项目成果

Short communication: 'Low activation, refractory, high entropy alloys for nuclear applications'

• DOI: 10.1016/j.jnucmat.2019.151744
• 发表时间: 2019-12-01
• 期刊: JOURNAL OF NUCLEAR MATERIALS
• 影响因子: 3.1
• 作者: Kareer, A.;Waite, J. C.;Wilkinson, A. J.
• 通讯作者: Wilkinson, A. J.

Controlling microstructure and mechanical properties of Ti-V-Cr-Nb-Ta refractory high entropy alloys through heat treatments

• DOI: 10.1016/j.jallcom.2022.167651
• 发表时间: 2022-10-22
• 期刊: JOURNAL OF ALLOYS AND COMPOUNDS
• 影响因子: 6.2
• 作者: Liu, Junliang;Scales, Robert J.;Armstrong, David E. J.
• 通讯作者: Armstrong, David E. J.

On the brittle-to-ductile transition of the as-cast TiVNbTa refractory high-entropy alloy

铸态TiVNbTa难熔高熵合金的脆塑转变

• DOI: 10.1016/j.mtla.2020.100940
• 发表时间: 2020
• 期刊: Materialia
• 影响因子: 3.4
• 作者: Scales R

High-Entropy Alloys for Advanced Nuclear Applications.

• DOI: 10.3390/e23010098
• 发表时间: 2021-01-11
• 期刊: Entropy (Basel, Switzerland)
• 作者: Pickering EJ;Carruthers AW;Barron PJ;Middleburgh SC;Armstrong DEJ;Gandy AS
• 通讯作者: Gandy AS

Microstructural and micromechanical assessment of aged ultra-fast sintered functionally graded iron/tungsten composites

• DOI: 10.1016/j.matdes.2020.108652
• 发表时间: 2020-06
• 期刊: Materials & Design
• 影响因子: 8.4
• 作者: S. Heuer;B. Li;David J Armstrong;Y. Zayachuk;C. Linsmeier